Amend Customer Order on Invoice Reprint Merged

Several users have expressed the need to reprint SOP invoices with a customer order number added. It is frequently the case that customers refuse to pay invoices unless their order number appears on it, and yet don't always provide this reference in a timely manner so the user has no choice but to go ahead and invoice the order. There is an option to reprint an invoice with an amended address; would be very useful if the customer order number could also be amended from this screen to enable an invoice to be re-printed with this information on.